remains constant

decreases

increases

none of these

12

14

16

32

equal to one

less than one

greater than one

none of these

drying and crushing the coal to a fine powder

moulding the finely ground coal under pressure with or without a binding material

heating the wood with a limited supply of air to temperature not less than 280 Degree Centigrade

none of the above

greater than

less than

equal to

none of the above